http://techland.time.com/2012/04/02/25-years-of-ibms-os2-the...
I tried it once a few years ago to see what fuss was about. It reminded me of a slightly-better Windows 3.1. Maybe one of those zealots in the article could show me in a live demo why it was great then or if it is now in any way. Not sure. The claimed reliability of it would be a lasting benefit if that was common vs what was achieved with a primitive, predictable application. High-security methods at code or compiler level might also be applied to it if it's relatively small.
Could be some potential but I think it's probably one of history's dead ends.